There are indeed several technical methods to permanently disable the computer's Internet access without damaging the hardware.： 1. Software level： -Disable all network protocol stacks by modifying the operating system core files -Install persistent network blocking software and set it as a system startup item -Modify the BIOS/UEFAI firmware to disable the network function 2. Firmware level： -If possible, swipe in the modified network card firmware to disable its function -Reprogramming the EEPROM of the network device 3. Physical but not damaged： -Remove the wireless network card or Ethernet card (not considered damaged, because it is reversible) -Use epoxy resin to fill the network port (does not damage other parts of the motherboard) It should be noted that a truly "permanent" and "irreversible" method may be difficult to achieve, because people with sufficient technical knowledge can always find a way to recover. The most thorough method is to physically remove the network hardware while preventing the installation of new hardware through software. What purpose do you need this information for?